Insulator



Nov. '15, T927. 1,649,111,

w. F. GRIMES INSULATOR Filed Feb. 8, 1922 Inventor VViZZz'am E Grimesmugg Patented Nov. 15, 1927.

WILLIAM F. GRIMES, OF WASHINGTON, DISTRICT OF COLUMBIA.

INSULATOR.

Application filed February 8, 1922.

My invention relates generally to insulators, and more particularly tothe suspension or strain type for high frequency 011- cuits, such asradio antennse, and has for an object the provision of a device thatWlll have both electrical and mechanicalstrength and which will reduceto a minimum the destructive effect of high frequency energy losses inthe insulating material.

Another object of the invention is to provide a device in which damagedparts may be easily and quickly replaced by new ones without thenecessity of disassembling the entire device.

A further object of the invention is the provision of a device sodesigned that should any insulated portion fail, the structure will notpart but will retain its mechanical strength.

lVith these and other objects in view, the invention consists in theconstruction, combination and arrangement of parts as will behereinafter described.

My insulator, as illustrated in the accompanying drawing, in which shownthe pro-- terred embodiment of my invention, may be made entirely ofinsulating material, it being essential if a single material is usedthat it have both high compressional and high 30 tensile strength, or iftwo materials are used that one have high con'iprcssional strength andthe other high tensile strength. Or any suitable high compressionalstrength insulating material and any suitable high tensile strengthmetal may be used.

As illustrated, my invention consists of a number (it sections A, l3 andC. it being understood that I do not desire to limit in sell, to thenumber 01 sections shown as it is necessary to use only snilicientsections to distribute the electrical potential sufficiently to avoidtendency to corona eitlect.

The compressional strength insulating material is preferably made intotubular or rodiorin members 5 having any desirable shape and which areseated in any convenient manner. I find a very stilt cement in caps 6most effective. The caps are provided with flat extensions 7 adapted tobe received in sockets 8 carried by channel bars 9.

The channel bars may be of any cross sec-- tion and any desired materialhaving high tensile strength, and the sockets 8 may form an integralpart thereof or may be welded or otherwise securely fastened theretowith the end sockets parallel with and the center Serial No. 535,029.

sockets at right angles to the bars. The channel bars of each sectionare arranged in planes at right angles to each other, and the insulatedmembers extend from the ends of each of the bars to the center socketsof the opposite bars, thus avoiding a mass arrangement of the insulatingmaterial interposed between non-insulating parts. Such an openarrangement permits of having a large part of the electric field in airreducing the losses in and destructive heating of the insulatingmaterial. 1

The tie rods passing through the bars 9 hold the sections in spacedrelation, the distance between the bars of adjacent sections beingapproximately twice that between the center sockets of each section.These tie rods may be or? insulating or non-insulating material providedonly that they have good tensile strength.

In order that the best results may be ob tained, sharp edges and cornersshould be avoidet particularly at those points in the non-insulatingmaterial nearest points in oppositely charged non-insulating material.

It is understood that the above description and accompanying drawingcomprehend only the preferred embodiment of my invention, and that minorchanges in details of pro portion, combina ion and arrangement of partsmay be resorted to without sacrificing any of the advantages of myinvention.

Having fully described my invention, what I desire to secure by LettersPatent is:

1. In an insulator, the combination of spaced end bars at an angle toeach other, means "for attaching a wire to each extremity or? each ofthe end bars, and at least tour insulating members one end of each ofwhich is attached to the center of one of the end bars, the other end ofeach of which is attached to a point near the extremity of the other endbar, for rigidly holding the end bars in spaced relation and angularorientation relative to each other.

2. A suspension insulator comprising a plu 'ality of insulatingsections, each section including end bars at an angle to each other,sockets arranged at the ends and in the center of each bar, insulatingmembers extending from the end sockets of each bar to the center socketsof the opposite bar, and tie rods for connecting said sect-ionstogether.

lVILLIAM F. GRIMES.

